Require ruby-prof >= 0.7.3. Tighten rescue clause.

init.rb

@@ -1,14 +1,17 @@
 begin
-  require 'action_profiler'
-  class ActionController::Base
-    include ActionController::ActionProfiler
-    logger.info "Action profiling enabled. Add around_filter :action_profiler to ApplicationController then append ?profile=process_time to any URL to profile the page load and download a calltree file. Open it with kcachegrind."
-  end
-rescue LoadError
+  gem 'ruby-prof', '>= 0.7.3'
+rescue Gem::LoadError
   class ActionController::Base
     def action_profiler(*args)
       logger.info "`gem install ruby-prof` to enable action profiling."
       yield
     end
+    logger.info "Action profiling disabled. `gem install ruby-prof` to enable."
+  end
+else
+  require 'action_profiler'
+  class ActionController::Base
+    include ActionController::ActionProfiler
+    logger.info "Action profiling enabled. Add around_filter :action_profiler to ApplicationController then append ?profile=process_time to any URL to profile the page load and download a calltree file. Open it with kcachegrind."
   end
 end